Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 05 Dec 2014

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

7(4)

28(28)

35(-)

4(2)

0.6(6)

18(57)

South

46(29)

25(25)

56(-)

4(2)

0.5(5)

15(54)

East

15(10)

19(19)

35(-)

9(4)

0.5(5)

13(52)

West

11(7)

29(29)

34(-)

11(5)

0.5(5)

15(54)

Central

36(22)

24(24)

56(-)

13(5)

0.5(5)

15(55)

1-hr PM2.5 (µg/m3)b Readings on 04 Dec 2014

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

30

33

26

21

17

22

23

26

16

9

6

8

South

19

17

12

13

16

16

16

16

19

10

10

10

East

13

13

15

18

16

12

19

16

11

9

8

9

West

23

21

26

26

31

22

17

17

11

7

7

11

Central

14

11

14

19

20

25

18

23

14

5

10

14

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

10

9

9

10

12

16

14

16

22

25

21

23

South

9

6

12

12

13

10

22

18

12

21

21

32

East

9

6

11

10

8

5

10

9

15

24

23

32

West

8

7

7

10

8

12

12

13

16

14

11

19

Central

13

10

8

11

17

14

18

20

16

14

21

16

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
04 Dec 2014

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

60

59

59

59

59

60

59

59

57

53

42

36

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

39

38

37

38

44

47

52

53

55

57

58

61

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.